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Also, the electron moving backwards in time would switch the charge and become its antiparticle: a positron.

When an electron and a positron meet, they annihilate each other. That could be considered the same single particle switching direction in time.

Indeed, that's the classic example given for a Feynman diagram and it shows the presence of a positron and its movement along -t.

This all begs the question, what happens to the electrons going into a black hole?

They are absorbed by neutronium.

> numerous

Yes, numerous